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19 tháng 11 2021

Đây là đề thi mà? Phải tự làm chứ!

19 tháng 11 2021

Em cần hỗ trợ bài nào?

12 tháng 11 2021

1. Because of studying hard, I passed the exam

2. Because of Hoa's richness, she could buy that house

3. Because of bad grades, she failed the University entrance exam

4. Because of the accident, I was late

5. Because of the terrible traffic, we didn't arrive until 6 o'clock

11 tháng 11 2021

Bài 1:

a. \(R=p\dfrac{l}{S}=1,10.10^{-6}\dfrac{30}{0,3\cdot10^{-6}}=110\Omega\)

b. \(I=U:R=220:110=2A\)

Bài 2:

a. \(R=R1+R2=30+50=80\Omega\)

b. \(I=I1=I2=0,25A\left(R1ntR2\right)\)

\(\left\{{}\begin{matrix}U1=I1\cdot R1=0,25\cdot30=7,5V\\U2=I2\cdot R2=0,25\cdot50=12,5V\\U=IR=0,25\cdot80=20V\end{matrix}\right.\)

11 tháng 11 2021

Câu 1.

a)\(R=\rho\cdot\dfrac{l}{S}=1,1\cdot10^{-6}\cdot\dfrac{30}{0,3\cdot10^{-6}}=110\Omega\)

b)\(I=\dfrac{U}{R}=\dfrac{220}{110}=2A\)

Câu 2.

a)\(R_{AB}=R_1+R_2=30+50=80\Omega\)

b)\(I_1=I_2=I_A=0,25A\)

   \(U_1=R_1\cdot I_1=30\cdot0,25=7,5V\)

   \(U_2=R_2\cdot I_2=50\cdot0,25=12,5V\)

   \(U_{AB}=U_1+U_2=7,5+12,5=20V\)

Câu 3.

a)\(R_{AB}=\dfrac{R_1\cdot R_2}{R_1+R_2}=\dfrac{600\cdot900}{600+900}=360\Omega\)

b)\(U_1=U_2=U_m=220V\)

   \(I_1=\dfrac{U_1}{R_1}=\dfrac{220}{600}=\dfrac{11}{30}A\)

   \(I_2=\dfrac{U_2}{R_2}=\dfrac{220}{900}=\dfrac{11}{45}A\)

   \(I_m=I_1+I_2=\dfrac{11}{30}+\dfrac{11}{45}=\dfrac{11}{18}A\)

11 tháng 11 2021

1. In spite of being a poor student, he studied very well

2. Despite the bad weather, she went to school on time

3. Despite having a physical handicap, she has become a successful woman

4. In spite of having not finished the paper, he went to sleep

5. Despite having a lot of noise in the city, I prefer living there

11 tháng 11 2021

1. In spite of being a poor student, he studied very well

2. Despite the fact that the weather was bad, she went to school on time.

20 tháng 11 2021

Bạn tách ra đi nhé! Chứ Sử mà như lày thì chết :v

2:

1+cot^2a=1/sin^2a

=>1/sin^2a=1681/81

=>sin^2a=81/1681

=>sin a=9/41

=>cosa=40/41

tan a=1:40/9=9/40

Bài 5:

a: 2x-(3-5x)=4(x+3)

=>2x-3+5x=4x+12

=>7x-3=4x+12

=>3x=15

=>x=5

b: =>5/3x-2/3+x=1+5/2-3/2x

=>25/6x=25/6

=>x=1

c: 3x-2=2x-3

=>3x-2x=-3+2

=>x=-1

d: =>2u+27=4u+27

=>u=0

e: =>5-x+6=12-8x

=>-x+11=12-8x

=>7x=1

=>x=1/7

f: =>-90+12x=-45+6x

=>12x-90=6x-45

=>6x-45=0

=>x=9/2